2 files changed, 5 insertions, 0 deletions
diff --git a/test/test_msg.cpp b/test/test_msg.cpp
index e4f35fa..ee13166 100644
--- a/test/test_msg.cpp
+++ b/test/test_msg.cpp
@@ -61,6 +61,8 @@ struct MsgTest {
     }
 };
 
+const opcode_t MsgTest::opcode;
+
 int main() {
     salticidae::MsgBase<opcode_t> msg(MsgTest(10));
     printf("%s\n", std::string(msg).c_str());
diff --git a/test/test_network.cpp b/test/test_network.cpp
index f84ead5..fd84c3b 100644
--- a/test/test_network.cpp
+++ b/test/test_network.cpp
@@ -71,6 +71,9 @@ struct MsgAck {
     MsgAck(DataStream &&s) {}
 };
 
+const opcode_t MsgHello::opcode;
+const opcode_t MsgAck::opcode;
+
 using MsgNetworkByteOp = MsgNetwork<opcode_t>;
 
 struct MyNet: public MsgNetworkByteOp {